Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5ab4d2a461a3af…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 18:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35451986a58314684d3f9b77ca05a9d0 SHA-1: 538ec4cf477b765d14d3eb26f8e4c0dfb591dc62 SHA-256: 7b5ab4d2a461a3af868a3baafdec8b5bd80eb7f0506046701df88e2b1b7d94ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, disguised with a seemingly innocuous keyword. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The PDF also contains a large number of links to external PDFs, many of which appear to be SEO-generated content, suggesting a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=audi+a3+dipstick+guide
    • https://cdn.shopify.com/s/files/1/0438/6150/8256/files/jingle_bell_old_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/buddha_story_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/ashapoorna_devi_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/lowazozinorowogikuxotanab.pdf
    • https://cdn.shopify.com/s/files/1/0430/9935/7338/files/bsc_nursing_2nd_year_syllabus_ruhs.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab1ce2e910374072bfb857a175e262b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf34964ee53040f0ae4f55e428970441.pdf
    • https://static.usrfiles.com/ugd/b8c837_da0534fc26834392a6891e7b16b012dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_be15e82486eb4077ada1821a06a4844a.pdf
    • https://static.usrfiles.com/ugd/b8c837_059c75bd1f784c759520fbf3d2df20cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a91bce7aa46a49479a868f6e3fa68656.pdf
    • https://static.usrfiles.com/ugd/b8c837_b22f59b59907468798f4fda32dbf3f5f.pdf
    • https://static.usrfiles.com/ugd/9b33c5_26fd584d3d304ce99b457dddb2fdff9b.pdf
    • https://static.usrfiles.com/ugd/c7a620_a115f73bd1084f39981b04fb9ba18e89.pdf
    • https://static.usrfiles.com/ugd/b8c837_195e06c7da894170a91d6081932901e9.pdf
    • https://static.usrfiles.com/ugd/6924eb_2a506997d1ed48b089ecc75891866b3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_40f16f11a69a442181997954451dbc2f.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f4c.bin
6f1add26ac5077c0da8de01f9fedd02c65946da14b472a16967f8cc50debfbd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4C 5332 bytes
font_01_sfnt_off00006181.bin
7f1c0054930728ee6a54e46c6372a28d0e01c6128bf7fbaa88a43e56fe2e61a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6181 10308 bytes
font_02_sfnt_off000084fc.bin
6ac8fcc3762401556b64742ddf9b44a8ffe90a1a2269e2bb24171cdceb310b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FC 16060 bytes

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